WO2022017298A1 - Signaux de réveil dans des systèmes cellulaires - Google Patents

Signaux de réveil dans des systèmes cellulaires Download PDF

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Publication number
WO2022017298A1
WO2022017298A1 PCT/CN2021/106923 CN2021106923W WO2022017298A1 WO 2022017298 A1 WO2022017298 A1 WO 2022017298A1 CN 2021106923 W CN2021106923 W CN 2021106923W WO 2022017298 A1 WO2022017298 A1 WO 2022017298A1
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Prior art keywords
wake
wus
signal
burst
signals
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PCT/CN2021/106923
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English (en)
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Sebastian Wagner
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Tcl Communication (Ningbo) Co., Ltd.
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Priority to CN202180060824.6A priority Critical patent/CN116325951A/zh
Publication of WO2022017298A1 publication Critical patent/WO2022017298A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • H04W52/028—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof switching on or off only a part of the equipment circuit blocks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the following disclosure relates to the transmission of wake-up signals in cellular networks, and in particular to the transmission of such signals in a beam-sweeping system.
  • Wireless communication systems such as the third-generation (3G) of mobile telephone standards and technology are well known.
  • 3G standards and technology have been developed by the Third Generation Partnership Project (3GPP) (RTM) .
  • RTM Third Generation Partnership Project
  • the 3rd generation of wireless communications has generally been developed to support macro-cell mobile phone communications.
  • Communication systems and networks have developed towards a broadband and mobile system.
  • UE User Equipment
  • RAN Radio Access Network
  • CN Core Network
  • LTE Long Term Evolution
  • E-UTRAN Evolved Universal Mobile Telecommunication System Territorial Radio Access Network
  • 5G or NR new radio
  • NR is proposed to utilise an Orthogonal Frequency Division Multiplexed (OFDM) physical transmission format.
  • OFDM Orthogonal Frequency Division Multiplexed
  • the NR protocols are intended to offer options for operating in unlicensed radio bands, to be known as NR-U.
  • NR-U When operating in an unlicensed radio band the gNB and UE must compete with other devices for physical medium/resource access.
  • Wi-Fi RTM
  • NR-U NR-U
  • LAA LAA
  • NR is intended to support Ultra-reliable and low-latency communications (URLLC) and massive Machine-Type Communications (mMTC) are intended to provide low latency and high reliability for small packet sizes (typically 32 bytes) .
  • URLLC Ultra-reliable and low-latency communications
  • mMTC massive Machine-Type Communications
  • a user-plane latency of 1ms has been proposed with a reliability of 99.99999%, and at the physical layer a packet loss rate of 10 -5 or 10 -6 has been proposed.
  • mMTC services are intended to support a large number of devices over a long life-time with highly energy efficient communication channels, where transmission of data to and from each device occurs sporadically and infrequently. For example, a cell may be expected to support many thousands of devices.
  • the disclosure below relates to various improvements to cellular wireless communications systems.
  • the wake up signal burst may be transmitted a predefined time offset prior to a paging occasion to which the wake up signal burst relates.
  • the time offset may be defined as the time from the end of the wake up signal burst to the start of the paging occasion.
  • the wake up signals of the burst may be transmitted continuously in adjacent symbols.
  • the wake up signals may be frequency multiplexed with SS/PBCH, SIB1, or PDCCH signals.
  • the at least one wake up signal of each beam may be the same, or the wake up signal may vary between beams.
  • the at least one wake up signal may comprise a base sequence with a cyclic shift dependent on the beam.
  • a method of transmitting a wake-up signal from a base station to a UE in a cellular communications system comprising transmitting a burst of wake up signals, the burst comprising at least one wake up signal transmitted on each beam, wherein the burst of wake up signal is arranged to not transmit during control transmissions.
  • the wake up signal burst is transmitted a predefined time offset prior to a paging occasion to which the wake up signal burst relates.
  • the time offset may be defined as the time from the end of the wake up signal burst to the start of the paging occasion.
  • Wake up signals on at least two beams may be transmitted in a set of adjacent symbols.
  • the set of adjacent symbols may span a switch between beams.
  • the burst may span at least two slots.
  • the wake up signals may be frequency multiplexed with SS/PBCH, SIB1, or PDCCH signals.
  • the multiplexing arrangement may be defined by higher layer signalling.
  • the at least one wake signal on a beam may be the same length as the signal with which it is multiplexed.
  • the at least one wake up signal on at least two of the beams may be the same.
  • the at least one wake signal on each beam may be different.
  • the at least one wake up signal on each beam may comprise a base sequence with a cyclic shift dependent on the beam.
  • the at least one wake up signal on each beam may utilise a different root of a Zadoff-Chu sequence.
  • the at least one wake up signal on each beam may have a length between 1 and 4 symbols.
  • the at least one wake up signal on each beam may be repeated.
  • the start position of the wake up signal burst may be signalled to a UE in higher layer signalling.
  • An SSB occasion may occur between the at least one wake up signal on a beam and the paging occasion to which the wake up signal relates.
  • At least one wake up signal may be a group wake up signal.
  • At least one wake up signal may be a common wake up signal for all UEs.
  • the group wake up signal may be defined by a cyclic shift g of a base sequence computed as
  • the wake up signals may be sequence-based.
  • the method may further comprise the step of selecting a time-frequency transmission pattern for the wake signals and indicating that pattern to UEs.
  • Figure 1 shows selected elements of a cellular communications system
  • FIG. 2 shows an example burst of WUS
  • Figure 3 shows an example burst of WUS and associated paging occasion
  • Figures 4 to 6 show examples of WUS multiplexed with SS/PBCH
  • FIGS 7 to 9 show examples of WUS multiplexed with SIB1 and other signals
  • FIG. 10 shows configurations for R15 WUS.
  • Figures 11 to 16 show configurable WUS patterns.
  • FIG. 1 shows a schematic diagram of three base stations (for example, eNB or gNBs depending on the particular cellular standard and terminology) forming a cellular network.
  • each of the base stations will be deployed by one cellular network operator to provide geographic coverage for UEs in the area.
  • the base stations form a Radio Area Network (RAN) .
  • RAN Radio Area Network
  • Each base station provides wireless coverage for UEs in its area or cell.
  • the base stations are interconnected via the X2 interface and are connected to the core network via the S1 interface.
  • a PC5 interface is provided between UEs for SideLink (SL) communications.
  • SL SideLink
  • the base stations each comprise hardware and software to implement the RAN’s functionality, including communications with the core network and other base stations, carriage of control and data signals between the core network and UEs, and maintaining wireless communications with UEs associated with each base station.
  • the core network comprises hardware and software to implement the network functionality, such as overall network management and control, and routing of calls and data.
  • MTC Machine-Type Communication
  • IoT static and nomadic devices
  • DRX discontinuous reception
  • paging occasions for the possible reception of paging messages are infrequent, the process of decoding a paging message is complex and consumes a relatively significant amount of power.
  • a UE must wake up prior to the expected Paging Occasion (PO) , turn on RF and baseband systems, synchronise in time and frequency, and attempt to decode PDCCH for a paging DCI scrambled with P-RNTI. If no paging DCI is detected the UE can return to sleep (DRX) .
  • PO Paging Occasion
  • a Wake-Up Signal may be transmitted for detection by UEs prior to a paging occasion in which a paging message is to be transmitted to a UE.
  • the WUS is typically sequence-based to enable easy detection without requiring decoding and baseband processing.
  • UEs are configured to wake-up to detect the WUS, and if the UE’s signal is detected the UE wakes up fully to receive the PDCCH at the appropriate time as it has confidence there is a paging message. If the WUS is not detected the UE can return to sleep.
  • the reduced complexity of detecting the WUS (which may be performed using a correlator) reduces power consumption compared to performing a full PDCCH decode.
  • the DRX system utilises a DRX cycle within which one or more PO is defined.
  • the DRX/paging cycle may be indicated in SIB1, or a UE-specific DRX cycle can be negotiated during NAS registration.
  • the paging cycle is 32, 64, 128, or 256 radio frames.
  • the Paging Frame and Paging Occasion are defined in accordance with the relevant standards, for example, TS 38.304.
  • the WUS in RRC_IDLE/INACTIVE is principally used for power saving by low-power UEs and robust detection is important.
  • Previous systems have sought to provide robustness using time-repetition and use of synchronisation signals required for time-frequency synchronisation before PDCCH detection.
  • NR synchronisation signals have a configurable periodicity, and beam-sweeping (particularly in FR2) requires that transmissions on each beam are short. Repetitions, or long WUS, lasting several milliseconds cannot be supported.
  • Set out in the following disclosure are techniques to provide an efficient WUS system, particularly for beam-sweeping systems operating at high frequencies.
  • MTC and NB-IoT devices support a bandwidth of 1.4MHz, in comparison to REDCAP NR devices which are anticipated to support at least 20MHz in FR1 and 50 to 100MHz in FR2. These additional resources may be utilised for longer WUS sequences, or WUS repetition in the frequency-domain, rather than time-domain repetition.
  • the WUS can be transmitted anywhere in the available time-frequency resources, can have any duration in terms of OFDM symbols, and the duration and the start or end of the WUS is known from pre-configuration.
  • FIG. 2 shows an example of such a burst transmission for 4 beams where the burst comprises at least one WUS for each beam (the WUS being the same on each beam) .
  • the WUS duration for each beam is kept short, 5 symbols in this example, to manage the time required for the beam-sweeping operation.
  • the starting position for each WUS transmission (on each beam) may be specified by standard, or configured for each base station, for example using higher layer (RRC) signalling. The starting position of each WUS in a burst will depend on the duration of the WUS.
  • one or more WUS may be transmitted on the resources indicated for WUS throughout this disclosure.
  • references are made to WUS in the singular, but this does not exclude a plurality of WUS being transmitted.
  • no WUS is transmitted in the first two or last two symbols of each slot. It may also be preferable not to transmit WUS in the middle of a slot to avoid conflict with PDCCH or PUCCH for URLLC transmissions.
  • the WUS transmission may be continuous in time with the base station switching beams during the transmission. However, this may not be possible for longer WUS while also avoiding the control transmissions at the start and end of each slot. As can be seen in Figure 2 only two WUS can be transmitted continuously without overlapping the control transmissions at the start and end of the slots. Where WUS are transmitted continuously, only the start position and duration need to be defined.
  • FR1 in NR is intended to support up to 4 beams for carrier frequencies ⁇ 3GHz and up to 8 beams between 3GHz and 6 GHz.
  • Tables 1 and 2 below show possible starting positions for 15kHz Sub-Carrier Spacing (SCS) for 4 and 9 beams respectively.
  • SCS Sub-Carrier Spacing
  • Table 1 Example of WUS starting positions for 15kHz SCS and FR1 ⁇ 3GHz (up to 4 beams) .
  • Table 2 Example of WUS starting positions for 15kHz SCS and FR1>3GHz ⁇ 6GHz (up to 8 beams) .
  • Tables 3 and 4 show possible starting positions for 30kHz SCS for 4 and 8 beams respectively.
  • Table 3 Example of WUS starting positions for 30kHz SCS and FR1 ⁇ 3GHz (up to 4 beams) .
  • Table 4 Example of WUS starting positions for 30kHz SCS and FR1>3GHz ⁇ 6GHz (up to 8 beams) .
  • Tables 5 and 6 show possible starting positions for the 64 beams when operating in FR2 for 120kHz and 240kHz SCS respectively.
  • the WUS length may be limited, for example to either 1 or 4 symbols, and the coverage increased by extending/repeating the WUS in the frequency or time domain.
  • the WUS burst is associated with a PO according to a defined time offset.
  • the PO occurs in SFN 64 and 4 PDCCH occasions are configured (one for each beam) .
  • the time offset which may be defined by higher layer configuration and signalling, is defined between the last slot of the WUS burst and the first slot of the PO (not between the WUS for a beam and the PDCCH monitoring occasion on that same beam) .
  • the PDCCH for each PO is configured via a search space and an associated CORESET.
  • the WUS has its own duration which may be longer than the CORESET duration for the associated PDCCH.
  • time offset may be defined as an absolute time in milliseconds, or another convenient set of units.
  • Table 7 shows possible configurations of SSB periodicity and example values for the time offset between the end of the WUS burst and the start of the PO.
  • Table 7 Example of possible vslues of timeOffset.
  • the shorter offsets of 5 and 10 ms may be beneficial where the WUS is frequency multiplexed with the SS/PBCH transmission (as discussed below) in which case the UE would detect WUS and SS/PBCH at the same time and be ready to decode a paging message soon after.
  • the time offset should be defined such that at last one SSB occasion occurs between the WUS and the PO such that the UE can synchronise with, and confirm, the serving cell.
  • the WUS may be multiplexed with other signals which need to be transmitted.
  • Cell-wide signals for example SS/PBCH or Type 0 common search space for SIB1, may be particularly appropriate for multiplexing.
  • a particular multiplexing arrangement may be configured via higher layer signalling, for example RRC.
  • Frequency multiplexing for example with SS/PBCH, may be most beneficial when both signals are of the same length, but the principles may still be applied when the lengths are different. It is preferable that the SCS of the multiplexed transmissions is the same to avoid gaps in frequency usage.
  • Figures 4 &5 show examples of a 4-symbol WUS frequency multiplexed with a 4-symbol SS/PBCH.
  • the particular multiplexing arrangement can be selected based on available resources and the arrangements of the figures are shown as examples only.
  • WUS is multiplexed with both transmissions, and transmission of WUS also continues between the transmissions.
  • the base station may select any direction for the intervening transmission to optimise performance. If the intervening time would interfere with a search space for control signalling the base station may not make any transmission and pause WUS transmission until the next SS/PBCH symbols.
  • Figure 7 shows an example of WUS multiplexed with SS/PBCH in FR2 with multiplexing pattern 3, where the paging search space is configured the same as searchSpaceZero.
  • the time offset discussed above describes the offset as multiples of the SSB periodicity.
  • the time offset is thus the time between the start of the WUS burst and the start of the first PDCCH monitoring occasion of the relevant PO. For example, if SSB periodicity is 20ms, and the time offset is 80 ms, WUS is transmitted with SS/PBCH 8 frames before the relevant PO.
  • WUS may be multiplexed with CSS0 since PDCCH is time-interleaved with the SS/PBCH/SIB1 transmission. This approach may be preferable if there are insufficient resources to multiplex WUS with SS/PBCH due to the multiplexing of SS/PBCH with SIB1.
  • Figure 8 shows an example of multiplexing pattern 2 with an SCS of 120kHz for all signals. This multiplexing pattern specifies one symbol for PDCCH, but depending on the SCS configuration of the PDCCH and the WUS, a WUS with either one or two symbol duration can be frequency multiplexed with the PDCCH.
  • Figure 8 shows an example with 2 beams.
  • WUS may also be frequency multiplexed with SIB1 or Type0 CSS and SIB1.
  • Figure 9 shows an example of WUS frequency multiplexed with Type0 CSS and SIB1 for multiplexing pattern 1 with the search space starting at slot 2. Only 2 beams are shown for clarity.
  • the definition of the time offset will depend on the WUS multiplexing scheme employed.
  • the time offset is the duration between the PO and Type0 CSS/SIB1 occasion with which the relevant WUS is multiplexed.
  • the WUS is the same for each beam.
  • the WUS may be beam-specific such that the signal indicates the beam on which it is transmitted. That is, the WUS may encode the beam index. This allows the UE to determine which beams have the best reception from detection of the WUS and can hence optimise SS/PBCH detection from the most well-received beam (s) .
  • beam-specific WUS does require the UE to monitor for multiple WUS, for example up to 64, and hence does add complexity.
  • this can be optimised , for example, by utilising a base sequence and with a beam-specific cyclic shift.
  • different roots of a Zadoff-Chu sequence may be utilised for each beam, or the beam index may be utilised to initialise the scrambling sequence used for the WUS.
  • Group WUS may be utilised to reduce unnecessary wake-ups of UEs sharing a PO with a UE which is being paged. It is currently proposed to support up to 4 WUS resources, where one WUS resource spans 2 PRBs and W max subframes (which is the same as prior WUS resource allocations) .
  • GWUS When using GWUS, if more than 1 group of UEs is paged the common WUS is transmitted to wake up UEs in all groups, but if only UEs in one group are paged the group-specific GWUS is transmitted.
  • UEs should be allocated to groups (and hence GWUS resources) according to the likelihood of them being paged. If UEs with a high probability of being paged are placed in different groups there is a higher likelihood of multiple groups being paged hence requiring the common WUS to be transmitted waking up all UEs.
  • WUS resource multiplexing in E-UTRA is proposed to be implicit, depending on whether R15 WUS is configured or not. If R15 WUS is not configured 1 bit is used to indicate the location of the WUS resource (s) and 2 bits select the WUS resource configuration ID among the first four resource configurations. The location of the WUS resource (s) is either n0 or n2.
  • Figure 10 shows the 4 possible configurations if R15 WUS is not configured and the frequency location of WUS resource 0 is configured to n0.
  • Each UE monitors for WUS in a single WUS resource for a common WUS and a GWUS.
  • the GWUS are obtained by a cyclic shift (g) of a base sequence computed as: -
  • the scrambling sequence is initialised depending on the associated PO and the cell ID, and the GWUS initialisation depends on the WUS resource ID
  • the legacy R15 WUS is always associated with leading to the same sequence used in R15.
  • WUS group alternation can be activated in GWUS configuration via gwus-GroupAlteration-r16.
  • Dependent on various parameters e.g. SFN, PO
  • the WUS resources are changed. For example, groups in WUS0 use WUS1 instead.
  • a PDCCH-based wakeup signal is undesirable as the required decoding requires significant power.
  • a sequence-based wakeup signal may therefore be desirable.
  • the WUS is likely to be principally used for power saving by low-power UEs (e.g. REDCAP, reduced coverage) and so the wake-up signal must be robustly detected.
  • REDCAP reduced coverage
  • REDCAP reduced capability
  • UEs for example 20MHz in FR1 .
  • Additional flexibility for achieving robust detection may therefore be available, which may be particularly beneficial for beam-based systems in which transmission time on each beam is limited.
  • Set out below are various techniques to utilise frequency diversity and/or multiplexing to achieve an efficient and reliable wake up system.
  • REDCAP NR devices are likely to support BWs of at least 20MHz in FR1 and 50 to 100MHz in FR2.
  • TS 38.101 (Table 5.3.2-1) specifies 106 PRB for FR1 20MHz at 15kHz SCS, the maximum transmission BW in FR1 is 100MHz with 273 PRBs.
  • 50Mhz and 100MHz are being considered corresponding to 32 and 66 PRBs for 120kHz SCS.
  • there are more frequency resources may be available for WUS transmission.
  • a longer WUS sequence or WUS repetition in the frequency-domain may be utilised instead of time-domain repetition.
  • LTE-MTC WUS was transmitted on 2 consecutive PRBs with a duration of up to several subframes and a granularity of a subframe (1ms) .
  • WUS resources are the time-frequency resources where one or more WUS sequences are transmitted. For instance, in LTE a WUS can be transmitted on frequency resources n0 which are the first 2 PRBs for a duration of M subframes. The WUS signal itself (i.e. the cyclic shift) depends on which group the UE belongs to. Moreover, in LTE-MTC as discussed above up to 4 WUS resources can be configured each supporting a different number groups.
  • WUS 0 spans 2 PRBs and 11 symbols which is the same as LTE-MTC with a length-132 sequence.
  • WUS 1 A different configuration of the same resources is shown as “WUS 1” where 11 PRBs and 2 symbols are allocated to the WUS.
  • WUS 2 can accommodate a sequence of length 144 spanning 3 PRBs and 4 symbols.
  • the frequency resources for WUS are fixed to 1 PRB and one repetition in the neighbouring PRB, i.e. 2 PRBs.
  • the repetitions in the time-domain are configurable and depend on the repetitions configured for the control channel MPDCCH.
  • MPDCCH Physical Downlink Control Channel
  • there are more frequency resources available than in LTE-MTC e.g. 106 PRB for 20MHz@15kHz SCS. Therefore, the repetitions in the frequency domain are configurable in addition to the time-domain repetitions.
  • the number and position in time-frequency for WUS resources is also configurable.
  • a WUS may have a sequence length of 144 spanning 4 symbols and 3 PRBs.
  • the sequence may be repeated N times in frequency and/or M times in the time-domain. Both M&N are configurable and may depend on the configuration of PDCCH or may be independent of PDCCH
  • FIG 12 shows a set of examples for WUS resources which may be configured according to the principles discussed herein.
  • WUS 0 spans 2 PRBs and 11 symbols and is repeated 3 times in the frequency domain. The UE must thus monitor 6 PRBs and 11 symbols for the WUS.
  • WUS 1 is repeated 2 times in the time domain, spanning a total of 4 symbols. A combination of repetition in time and frequency is shown by WUS 3, which is repeated 2 times in both the frequency and time domain.
  • Table 8 below shows example WUS configuration parameters. The absence of a parameters may indicate no repetition.
  • each WUS resource is associated with a configured number of groups, e.g. WUS resource 1 supports 4 groups and WUS resource 3 supports 8 groups. Within each WUS resource, the groups are differentiated by different cyclic shifts of a base WUS sequence. All WUS have the same time-frequency allocation and hence the same detection performance. However, in NR where the repetition can be configured in the frequency domain, each WUS resource can have a different configurable number of repetitions. This allows groups to be configured for REDCAP devices with more repetitions and groups for other devices with less repetitions.
  • WUS resource 0 (WUS 0) has no repetitions
  • WUS 2 has one repetition in the frequency domain
  • WUS 2 has two repetitions in both the frequency and the time domain.
  • UEs with poor coverage can be assigned to WUS resource 2 and UEs in good coverage WUS resource 0.
  • This flexible WUS resource allocation allows to maximize spectrum utilization.
  • LTE-MTC the 4 WUS resources can be multiplexed in a 2-FDM 2-TDM manner.
  • more frequency resource are available and 4 WUS resources can be multiplexed entirely in frequency domain.
  • a 3-FDM pattern has been proposed in LTE-MTC.
  • the signalling of the flexible configuration can be achieved through a sorted list with a size of the configured number of WUS resources, where the first entry corresponds to WUS resource 0 the second entry to WUS resource 1 etc.
  • An example is shown in Table 9 below, where the list of frequency/time repetitions wus-resourceRepetitionFreqList/wus-ResourceRepetitionTimeList is a sorted list that configures the number of repetitions for each WUS resource individually.
  • Every UE is only required to monitor WUS in a single WUS resource.
  • the location of the WUS resources is configurable.
  • NR allows for more flexibility in the frequency domain since more bandwidth is available. It is therefore disclosed to allow different WUS resource patterns in the time-frequency which may be configurable.
  • Figure 14 shows examples of possible resource patterns for up to 4 WUS resources (4 WUS are used as an example only, other numbers may be utilised) .
  • the numbering of the WUS resources is an example used for explanation only.
  • each WUS resource is depicted of the same size but can actually comprise different numbers of time-frequency resources.
  • Pattern 0 in Figure 14 is the same as agreed in LTE-MTC for GWUS without legacy R15 WUS.
  • resource pattern 1 all WUS resources are multiplexed consecutively in the frequency domain whereas in pattern 2, they are spaced non-consecutively to exploit frequency diversity and to leave space for interlacing the same pattern with a different frequency offset.
  • Patterns 3 and 4 multiplex WUS resources in both time and frequency and can be used to alternate between them (as discussed in more detail below) .
  • patterns 3 and 4 can also be spaced apart in frequency like pattern 2 but this is not shown in Figure 14.
  • a configurable frequency offset (which may be indicated as a parameter to the first WUS resource (WUS 0) ) allows orthogonal patterns to be defined which do not interfere with each other.
  • pattern 2 in Figure 14 may be configured with 2 different frequency offsets to provide two WUS resource allocations that are orthogonal in the frequency domain.
  • the same pattern with different frequency offsets can therefore be configured in (for example) two adjacent cells to reduce the potential for inter-cell interference between their WUS sequences.
  • patterns 3 and 4 can be used in two proximal/adjacent cells as the patterns are orthogonal.
  • the configuration for a base station may therefore define the resource patterns available for WUS signals and allow configuration of which patterns to utilise.
  • FIG. 15 shows an example of two WUS resource patterns which are multiplexed around the SS/PBCH transmissions.
  • the WUS resources are aligned such that WUS resources 0 and 1 within each pattern are adjacent to SS/PBCH such that there is no gap them and SS/PBCH if only 1 or 2 WUS are configured.
  • the arrangement of the patterns, with sequential resources at opposite sides of the SS/PBCH resources maximises frequency diversity.
  • pattern 1 could be configured as two patterns, one using WUS resources 0 and 2 and the other using WUS resources 1 and 3. Frequency offsets for each pattern then position them at either side of the SS/PBCH resources.
  • the two patterns can be different or be the same with different frequency offsets.
  • the bundling can be indicated in configuration messaging by specifying which patterns are bundles. When bundling enabled, the numbering of WUS resources is applied to the bundled WUS resources.
  • Configuration may also enable a UE to switch between a configurable number of WUS multiplexing patterns.
  • LTE GWUS group alternation allows groups configured for one WUS resource to hop/alternate with groups configured for another WUS resource. This arrangement allows additional time/frequency diversity but assumes all WUS resources are configured with the same amount of resources, otherwise detection performance may vary.
  • the pattern alternation discussed below may allow more frequency diversity without resource fragmentation and may support WUS resources with different resources configurations to ensure reduced coverage UEs are assigned to WUS resources with more resources.
  • Figure 16 shows an example of three WUS resource patterns.
  • Group alternation can be utilised within a pattern to alternate resources. For example, if group alternation is activated for pattern 2, WUS resource 0 can switch with WUS resource 3 to provide frequency diversity. In this example, the WUS resources are fragmented and so it can be hard for the base station to schedule other transmissions in the gaps between the WUS resources.
  • Pattern alternation can be implemented in which the base station alternates between two or more WUS patterns, for example, pattern 0 and pattern 1. This provides frequency diversity but ensures the WUS resources in each transmission are concentrated in one contiguous section of time/frequency resources, thereby improving the availability of resources for use by other transmissions. Alternation may be configured using higher layer (RRC) signalling.
  • RRC higher layer
  • orthogonal patterns have been selected for adjacent cells care may be required to ensure that enabling alternation does not degrade the orthogonality and cause performance issues.
  • the selection of resource patterns to utilise may depend on: -
  • Paging Occasion e.g. alternate between POs or cycle through all configured patterns.
  • a pre-configured alternation periodicity or pattern For example alternate the pattern every 2 POs, or alternate according to a pattern (for example –Pattern 0, Pattern 0, Pattern 1, Pattern 0) .
  • a reference point may be defined, for example SFN 0 may be utilised.
  • the length-132 sequence of LTE-MTC spans 12 subcarriers and 11 symbols.
  • a WUS sequence of 11 symbols might be too long to fit within the time available on a beam in a beam-switching system which only has a short transmission time for cell-wide signals such as WUS.
  • the LTE-MTC sequence should be reduced to 1 symbol, and hence expanded to 132 sub-carriers (11 PRBs) .
  • the repetitions in time and frequency are then configurable.
  • the same design principle may be utilised (a single base sequence with different cyclic shifts and an orthogonal cover code) , but with a different length to fit the time available for transmission on a beam in NR.
  • the sequence may be a multiple of 4 symbols and 12 PRBs for efficient multiplexing with SS/PBCH.
  • ⁇ Cover code over multiple frequency repetitions Allow cover code to extend to multiple frequency repetitions of the base sequence (in addition to time domain) . This will improve interference randomization among different sequences due to a longer cover code which is especially beneficial if only repetitions in the time-domain are configured.
  • Beam-specific WUS In case a beam-specific WUS is used, the scrambling sequence is initialized with the beam index to reduce interference between beams.
  • the parameter K is configurable, for example using higher layer (RRC) signalling.
  • the WUS sequence w (m) of length N is defined as: -
  • n m mod N (7)
  • the cover code ⁇ nfns (m′) is defined as: -
  • n f and n n is the first frame of the first PO and the first slot of the first PO to which the WUS is associated, respectively.
  • N beam is the beam index on which the WUS is to be transmitted.
  • the scrambling sequence is initialised with the beam index N beam as shown above at equation (10) .
  • the resulting sequence w of length N ⁇ (M. K-1) is assigned in a time-first or frequency-first manner to resource elements (k, l) of the first K repetition within the WUS resource
  • the sequence is repeated in the next K repetitions until all repetitions are filled.
  • the exact location of the WUS resource is signalled by the higher layers (RRC) .
  • any of the devices or apparatus that form part of the network may include at least a processor, a storage unit and a communications interface, wherein the processor unit, storage unit, and communications interface are configured to perform the method of any aspect of the present invention. Further options and choices are described below.
  • the signal processing functionality of the embodiments of the invention especially the gNB and the UE may be achieved using computing systems or architectures known to those who are skilled in the relevant art.
  • Computing systems such as, a desktop, laptop or notebook computer, hand-held computing device (PDA, cell phone, palmtop, etc. ) , mainframe, server, client, or any other type of special or general purpose computing device as may be desirable or appropriate for a given application or environment can be used.
  • the computing system can include one or more processors which can be implemented using a general or special-purpose processing engine such as, for example, a microprocessor, microcontroller or other control module.
  • the computing system can also include a main memory, such as random access memory (RAM) or other dynamic memory, for storing information and instructions to be executed by a processor. Such a main memory also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor.
  • the computing system may likewise include a read only memory (ROM) or other static storage device for storing static information and instructions for a processor.
  • ROM read only memory
  • the computing system may also include an information storage system which may include, for example, a media drive and a removable storage interface.
  • the media drive may include a drive or other mechanism to support fixed or removable storage media, such as a hard disk drive, a floppy disk drive, a magnetic tape drive, an optical disk drive, a compact disc (CD) or digital video drive (DVD) (RTM) read or write drive (R or RW) , or other removable or fixed media drive.
  • Storage media may include, for example, a hard disk, floppy disk, magnetic tape, optical disk, CD or DVD, or other fixed or removable medium that is read by and written to by media drive.
  • the storage media may include a computer-readable storage medium having particular computer software or data stored therein.
  • an information storage system may include other similar components for allowing computer programs or other instructions or data to be loaded into the computing system.
  • Such components may include, for example, a removable storage unit and an interface , such as a program cartridge and cartridge interface, a removable memory (for example, a flash memory or other removable memory module) and memory slot, and other removable storage units and interfaces that allow software and data to be transferred from the removable storage unit to computing system.
  • the computing system can also include a communications interface.
  • a communications interface can be used to allow software and data to be transferred between a computing system and external devices.
  • Examples of communications interfaces can include a modem, a network interface (such as an Ethernet or other NIC card) , a communications port (such as for example, a universal serial bus (USB) port) , a PCMCIA slot and card, etc.
  • Software and data transferred via a communications interface are in the form of signals which can be electronic, electromagnetic, and optical or other signals capable of being received by a communications interface medium.
  • computer program product may be used generally to refer to tangible media such as, for example, a memory, storage device, or storage unit.
  • These and other forms of computer-readable media may store one or more instructions for use by the processor comprising the computer system to cause the processor to perform specified operations.
  • Such instructions generally 45 referred to as ‘computer program code’ (which may be grouped in the form of computer programs or other groupings) , when executed, enable the computing system to perform functions of embodiments of the present invention.
  • the code may directly cause a processor to perform specified operations, be compiled to do so, and/or be combined with other software, hardware, and/or firmware elements (e.g., libraries for performing standard functions) to do so.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • the software may be stored in a computer-readable medium and loaded into computing system using, for example, removable storage drive.
  • a control module (in this example, software instructions or executable computer program code) , when executed by the processor in the computer system, causes a processor to perform the functions of the invention as described herein.
  • inventive concept can be applied to any circuit for performing signal processing functionality within a network element. It is further envisaged that, for example, a semiconductor manufacturer may employ the inventive concept in a design of a stand-alone device, such as a microcontroller of a digital signal processor (DSP) , or application-specific integrated circuit (ASIC) and/or any other sub-system element.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • aspects of the invention may be implemented in any suitable form including hardware, software, firmware or any combination of these.
  • the invention may optionally be implemented, at least partly, as computer software running on one or more data processors and/or digital signal processors or configurable module components such as FPGA devices.
  • an embodiment of the invention may be physically, functionally and logically implemented in any suitable way. Indeed, the functionality may be implemented in a single unit, in a plurality of units or as part of other functional units.
  • the present invention has been described in connection with some embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the scope of the present invention is limited only by the accompanying claims. Additionally, although a feature may appear to be described in connection with particular embodiments, one skilled in the art would recognise that various features of the described embodiments may be combined in accordance with the invention. In the claims, the term ‘comprising’ does not exclude the presence of other elements or steps.

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Abstract

L'invention concerne des procédés et des motifs pour la transmission de signaux de réveil dans un système de communication cellulaire à balayage de faisceaux. Au moins un signal de réveil est transmis sur chaque faisceau dans une salve.
PCT/CN2021/106923 2020-07-23 2021-07-16 Signaux de réveil dans des systèmes cellulaires WO2022017298A1 (fr)

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Citations (4)

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WO2018210135A1 (fr) * 2017-05-17 2018-11-22 维沃移动通信有限公司 Procédé de transmission de données, station de base et terminal
US20190059056A1 (en) * 2017-08-18 2019-02-21 Qualcomm Incorporated Transmission of wakeup signal through millimeter wave and sub-6 ghz bands
US20200037247A1 (en) * 2018-07-25 2020-01-30 Mediatek Inc. Wake-up signal operation for ue power saving
WO2020145624A1 (fr) * 2019-01-10 2020-07-16 Samsung Electronics Co., Ltd. Procédé et appareil pour surveiller un canal physique de commande en liaison descendante

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WO2018210135A1 (fr) * 2017-05-17 2018-11-22 维沃移动通信有限公司 Procédé de transmission de données, station de base et terminal
US20190059056A1 (en) * 2017-08-18 2019-02-21 Qualcomm Incorporated Transmission of wakeup signal through millimeter wave and sub-6 ghz bands
US20200037247A1 (en) * 2018-07-25 2020-01-30 Mediatek Inc. Wake-up signal operation for ue power saving
WO2020145624A1 (fr) * 2019-01-10 2020-07-16 Samsung Electronics Co., Ltd. Procédé et appareil pour surveiller un canal physique de commande en liaison descendante

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